看似随机的JavaScript

Question

查看暗网页面上的源代码，我发现了一些奇怪的JavaScript。它是角色[(!+的长组合。这个字符串重复： [][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]

这是令人困惑的代码：

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我无法分享链接，因为它是暗网，整个脚本超过4,000行。我将其复制到文本编辑器中，并将 Ctrl + F 'd复制到重复的字符串中：

这个脚本在做什么？

Answer 1

混淆和编码

代码显然已被混淆或编码，并且在您没有做大量工作的情况下不太可能轻易识别或理解。

您可以找到an article here detailing a similar encoding process，它会获取一组给定的代码，并将其缩减为以下几组字符：

• []访问数组元素，对象属性，获取数字并将元素转换为字符串。
• ()调用函数并避免解析错误。
• +将字符串，求和元素附加到数字上。
• !将元素投射到布尔值。
• {}获取NaN和臭名昭着的字符串“[object Object]”

解码您的示例

尝试a few different approaches that rely on decoding the code provided后，您看到重复的片段似乎评估为：

eval(x)

如果您仍然对代码本身感兴趣，我建议您使用上面的链接获取一些额外的代码，以确定x可能是什么。

在此解码

基于更多的研究，看起来解码格式的函数实际上非常简单，并且包含了一个示例解码器以及下面的基础函数：

function decode(encodedString) {
    // This should undo the chaos within your code
    return (/\n(.+)/.exec(eval(encodedString.replace(/\s+/, "").slice(0, -2)))[1]);
}

function decode() {
  try {
    var code = document.querySelector('#code');
    if (code.value.length <= 0) {
      return;
    }
    code.value = (/\n(.+)/.exec(eval(code.value.replace(/\s+/, "").slice(0, -2)))[1]);
  } catch (err) {
    alert('Your code wasn\'t messed up enough. Try something really bad. (i.e. the decoder didn\'t work)');
    code.value = '';
    code.focus();
  }
}

textarea {
  width: 90%;
  resize: none;
  height: 125px
}

<h2>Enter Your Code</h2>
<textarea id='code'></textarea>
<button onClick='decode()'>Decode</button>